Logic II Counters & Register Lecture 3 Review Questions
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Questions and Answers

What type of counter is the 74HC163 in the given example?

  • MOD-16 counter
  • MOD-8 counter
  • MOD-10 counter (correct)
  • MOD-12 counter
  • What is required for these counters to be synchronously cleared?

  • Active-low CLR input and PGT on CLK (correct)
  • Active-low CLR input and POS edge on CLK
  • Active-high CLR input and NEG edge on CLK
  • Active-high CLR input and PGT on CLK
  • What happens if any of the count enable controls is inactive (LOW) in the 74ALS160-163/74HC160-163 Series counters?

  • The counter will skip counts
  • The counter will reset to 0
  • The counter will hold its current count (correct)
  • The counter will keep counting ignoring the inactive controls
  • How is the count function controlled in the 74ALS160-163/74HC160-163 Series counters?

    <p>By clock signal CLK and inputs A, B, C, D</p> Signup and view all the answers

    What is the function of ENT in the 74ALS160-163/74HC160-163 Series counters?

    <p>ANDs with ENP to control count function</p> Signup and view all the answers

    How can the 74HC163 counter be preset to a specific value?

    <p>By applying an active-low LOAD input</p> Signup and view all the answers

    What is the purpose of using a decoding network for a counter?

    <p>To generate different output signals at specific counts of the counter</p> Signup and view all the answers

    Why does the indicator LED method become inconvenient as the size of the counter increases?

    <p>It becomes much harder to decode the displayed results mentally</p> Signup and view all the answers

    How many AND gates are required to decode completely all of the states of a MOD-32 binary counter?

    <p>32</p> Signup and view all the answers

    What are the inputs to the gate that decodes for the count of 21 (that is, 10101₂) in a binary counter?

    <p>Q₄ʹ, Q₃, Q₂ʹ, Q₁, Q₀</p> Signup and view all the answers

    What is the purpose of the step-by-step analysis process described in the text?

    <p>To predict the next state of the counter based on the present state</p> Signup and view all the answers

    What is the main difference between active-HIGH and active-LOW decoding for a counter?

    <p>Active-HIGH uses AND gates, while active-LOW uses NAND gates</p> Signup and view all the answers

    What is the purpose of the LOAD control input in the 74HC160 counter?

    <p>To load the counter with the parallel data inputs</p> Signup and view all the answers

    If the D/U control input of the 74HC160 counter is LOW, what will happen when a positive-going transition (PGT) occurs on the CLK input?

    <p>The counter will increment</p> Signup and view all the answers

    What is the purpose of the MAX/MIN output in the 74HC160 counter?

    <p>To indicate when the counter has reached its maximum or minimum value</p> Signup and view all the answers

    In the example with the 74HC190 counter, what condition must be met for the RCO (Ripple Carry Output) to be enabled?

    <p>The CTEN (Count Enable) input must be LOW</p> Signup and view all the answers

    In the comparison between the 74ALS163 and 74ALS191 counters, what is the difference in their LOAD input control?

    <p>The 74ALS163 has an asynchronous load, while the 74ALS191 has a synchronous load</p> Signup and view all the answers

    In the timing diagram for the 74HC160 counter, what is the initial state of the counter?

    <p>0000</p> Signup and view all the answers

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